Remanufacturing the HP 2500, 2550 & 2840 Black &

Color Cartridges

By Tim Farrell, Faroudja Toner Technical

Manager

HP 2840 Cartridge

1. Remove the three screws that hold the end cap (gearless side) in place as shown. Note that one screw will be smaller than the other two.

2. End cap removed.

3. Remove the two screws on the opposite side (with gears) that hold the end cap in place.

4. Remove the end cap. Note the position of the gears before removing them.

5. Remove the gears and set them aside.

RECYCLING TIP

Clean the electrical contacts located at the ends of the end cap.

6. Remove the two screws that hold the stabilizer plate in place. This plate supports both the developer roller and the toner transfer roller.

7. Stabilizer plate removed.

8. Remove the two screws on the opposite side (gearless) that hold in place the plate near the toner fill plug.

9. Plate removed.

10. Remove the developer roller as shown.

11. Do not lose the white bearings located at the ends of the developer roller.

REMOVING THE DOCTOR BLADE

12. First, use a small flathead screwdriver to pry off the back of the doctor blade cover as shown.

13. Doctor blade cover removed.

14. Second, remove the two screws that hold the doctor blade in place as shown.

15. Third, using an x-acto knife carefully cut away the adhesive gum that seals the back ends of the doctor blade and the plastic cartridge.

NOTE: You will need to re-seal the back ends of the doctor blade onto the cartridge using a similar adhesive or caulking before reinstalling it.

16. Doctor blade removed. Be careful not to lose the small spring at the end of the doctor blade.

REMOVING THE OEM CHIP

17. Use a small flathead screwdriver to pry off the chip that is glued to the top of the cartridge as shown.

18. Once the chip is removed, a new one must be fitted before the cartridge is complete.

REMOVING THE TONER FILL PLUG

19. Using a small flathead screwdriver, remove the toner fill plug as shown.

20. Toner fill plug removed. Clean out the residual toner thoroughly using compressed air or a vacuum.

REPLACING THE DOCTOR BLADE SEALING FOAM

21. Using a scalpel, cut away a small portion of the foam so that you can easily pull out the rest with your hand.

NOTE: If you are not replacing the doctor blade foam seal, skip directly to step 23: “Reinstalling the Doctor Blade.”

22. Carefully apply a new sealing foam adhesive strip. Faroudja Toner doctor blade sealing foam strip (#10049) shown.

REINSTALLING THE DOCTOR BLADE

23. First, apply gum adhesive or caulking to the back ends of the doctor blade to seal it back into place. Reinstall the doctor blade screws and spring.

24. Refill and recap the toner cartridge. Continue assembling the cartridge following the previous “disassembly” steps in reverse. This completes the process.

The technical staff of Faroudja Toner can be reached at 650-593-3862, or by visiting www.faroudjatoner.com. You can also contact them by email by clicking here.